I don't think the brake booster uses any of your efficiency at all, since you're at neutral or negative throttle when you're hitting the brakes.
If you really wanted - you could add an electric vacuum pump for your brake booster. It would negatively impact your efficiency though, b/c it would have to drain electrical energy that would put more load on the engine via the alternator.
The electrically driven power steering pump would be better suited with a position switch (which I also believe the MR-2 has). That would make it so the pump was only moving while you were steering.
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